A sterile implantable device designed to replace the proximal femoral neck as part of a total hip arthroplasty (THA). The device is contoured to enable fixation by pressing the distal end into the cortex of the remaining natural femur to achieve a mechanical interlock without the use of bone cement. The device is made of metal [e.g., cobalt-chrome (Co-Cr), titanium (Ti), stainless steel].